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• W4296703696 abstract "ABSTRACT Crosslinking mass spectrometry (XL-MS) is emerging as a unique method at the crossroads of structural and cellular biology, uniquely capable of identifying protein-protein interactions with residue-level resolution and on the proteome-wide scale. With the development of crosslinkers that can form linkages inside cells and easily cleave during fragmentation on the mass spectrometer (MS-cleavable crosslinks), it has become increasingly facile to identify contacts between any two proteins in complex samples, including in live cells or tissues. Photo-crosslinkers possess the advantages of high temporal resolution and high reactivity, thereby engaging all residue-types (rather than just lysine); nevertheless, photo-crosslinkers have not enjoyed widespread use, and have yet to be employed for proteome-wide studies, because their products are challenging to identify, and an MS-cleavable photo-crosslinker has not yet been reported. Here, we demonstrate the synthesis and application of two heterobifunctional photo-crosslinkers that feature diazirines and N -hydroxy-succinimidyl carbamate groups, the latter of which unveil MS-cleavable linkage upon acyl transfer to protein targets. Moreover, these crosslinkers demonstrate high water-solubility and cell-permeability. Using these compounds, we demonstrate the feasibility of proteome-wide photo-crosslinking mass spectrometry (photo-XL-MS), both in extracts and in cellulo . These studies provide a partial interaction map of the E. coli cytosol with residue-level resolution. We find that photo-XL-MS has a propensity to capture protein-protein interactions, particularly involving low-abundance uncharacterized proteins, suggesting it could be a powerful tool to shed light on the “darker” corners of the proteome. Overall, we describe methods that enable the detection of protein quinary interaction networks in their native environment at residue-level resolution proteome-wide, and we expect they will prove useful toward the effort to explore the molecular sociology of the cell. TOC graphic" @default.
• W4296703696 created "2022-09-23" @default.
• W4296703696 creator A5046098531 @default.
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• W4296703696 date "2022-09-20" @default.
• W4296703696 modified "2023-09-26" @default.
• W4296703696 title "Proteome-Wide Photo-Crosslinking Enables Residue-Level Visualization of Protein Interaction Networks <i>in vivo</i>" @default.
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• W4296703696 doi "https://doi.org/10.1101/2022.09.20.508727" @default.
• W4296703696 hasPublicationYear "2022" @default.
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